Update aarch64 feature detection #2281

Job	Run time
Check Style	12s
Build std_detect	1m 0s
Build Documentation	1m 15s
Env Override (ubuntu-latest)	12s
Test (i686-unknown-linux-gnu)	54s
Env Override (windows-latest)	23s
Automatic intrinsic verification	27s
Test (x86_64-unknown-linux-gnu)	52s
Test (x86_64-unknown-linux-gnu-emulated)	54s
Test (arm-unknown-linux-gnueabihf)	37s
Test (armv7-unknown-linux-gnueabihf)	54s
Test (aarch64-unknown-linux-gnu)	55s
Test (riscv64gc-unknown-linux-gnu)	49s
Test (powerpc64le-unknown-linux-gnu)	54s
Test (s390x-unknown-linux-gnu)	38s
Test (wasm32-wasip1)	42s
Test (i586-unknown-linux-gnu)	50s
Test (nvptx64-nvidia-cuda)	30s
Test (thumbv6m-none-eabi)	12s
Test (thumbv7m-none-eabi)	13s
Test (thumbv7em-none-eabi)	12s
Test (thumbv7em-none-eabihf)	15s
Test (x86_64-apple-darwin)	55s
Test (aarch64-apple-darwin)	47s
Test (x86_64-pc-windows-msvc)	49s
Test (i686-pc-windows-msvc)	49s
Test (aarch64-pc-windows-msvc)	51s
Test (x86_64-pc-windows-gnu)	48s
success	1s
	18m 50s

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